Terminating Resistance Circuit for Differential BMS Bus End Nodes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery management systems face challenges in accurately and simply setting terminating resistances for differential input mode communication, leading to potential mistakes and failures in terminating resistance placement.
Innovation Solution
A terminating resistance setting circuit that automatically sets the terminating resistance using a wake-up signal during ID assignment, eliminating the need for manual insertion and reducing errors by generating the resistance only at the communication node termination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual insertion of terminating resistance is used, then the terminating resistance can be physically added to the communication node, but mistakes and failures may occur in positioning and insertion accuracy
Solution Approach 1:
The system automatically determines which communication node should have terminating resistance and configures it through software control rather than manual intervention. The controller autonomously identifies termination nodes based on communication protocol requirements and activates the terminating resistance function accordingly, eliminating human error in positioning and insertion.
Solution Approach 2:
The patent replaces the mechanical approach of physically inserting resistors with an electronic/software-based solution. Instead of manually adding physical components to the communication bus, the system uses a controller to electronically configure and activate terminating resistance through software control, substituting mechanical insertion with digital configuration.
2Reliability
If terminating resistance is always set at all communication nodes, then reflection phenomenon is avoided, but communication efficiency is reduced due to unnecessary resistance at intermediate nodes
Solution Approach 1:
The patent applies terminating resistance only at specific locations (end nodes of the communication bus) rather than uniformly at all communication nodes. The controller identifies which nodes are termination points based on the communication topology and activates terminating resistance only at those specific locations, leaving intermediate nodes without resistance to maintain signal integrity while avoiding unnecessary damping.
Solution Approach 2:
The system dynamically configures terminating resistance based on real-time communication requirements and node identification. Rather than having fixed terminating resistance at all nodes, the controller adaptively activates or deactivates the terminating resistance function at each node depending on whether it is identified as a termination point during communication operations.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention relates to a terminating resistance setting circuit and a battery management system including the same, the battery management system. There is provided the battery management system in a battery system including a plurality of battery modules, the battery management system including at least module controllers that respectively control the plurality of battery modules, in which the module controllers communicate with each other through a differential input mode, and each of a plurality of battery modules includes a terminating resistance setting circuit including a resistance generation unit connected between a pair of communication lines for differential input to generate a terminating resistance, a first control circuit that applies a first control signal to the resistance generation unit, and a second control circuit formed between the resistance generation unit and a reference potential and controlled to apply a voltage according to the reference potential to the resistance generation unit by a second control signal.